Fig. 4.
Sonic-point radius and temperature during the ≈3 * 103 yr of evolution of our numerical calculations (Sect. 4 and Fig. 3). Each point corresponds to a model (≈100 000 models), color-coded as a function of the estimated optical depth at the sonic point (color bar on the right side). The S Dor cycle proceeds clockwise, as indicated by the black arrow.
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